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a
Erythroblastosis foetalis could be fatal to the mother
b
Majority of humans are Rh positive
c
Erythroblastosis foetalis can be avoided by administering anti-Rh antibodies to the first child
d
Majority of humans are Rh negative
answer is B.
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Detailed Solution
The Rh antigen similar to one present in Rhesus monkeys, is observed on the surface of RBCs of majority (nearly 80per cent) of humans.Erythroblastosis foetalis is fatal to the foetus. It can be avoided by administering anti-Rh antibodies to the mother, immediately after the birth of the first child.